940 results about "Feed pump" patented technology

The invention relates to a method for continuously producing 1, 1, 1, 3-tetrachloropropane, which comprises the following steps: adopting a loop reactor in which a beam pipe is arranged in the reactor, mixing reaction raw materials ethylene and carbon tetrachloride at a Venturi nozzle at the lower part of the reactor through a gas circulation loop and a liquid circulation loop outside the reactor, and spraying into the reactor filled with a main catalyst. A cocatalyst and a chelating agent are added into a carbon tetrachloride raw material in advance, are pumped into a liquid loop by a feeding pump and then enter a reactor. Reaction raw materials are circularly stirred under the action of a beam pipe in the reactor, so that solid, liquid and gas phases are fully mixed. By adopting the method disclosed by the invention, the selectivity and the production efficiency of the 1, 1, 1, 3-tetrachloropropane can be greatly improved, and the method also has the advantages of simplicity in operation, environment friendliness, long service life of the catalyst and low cost.

The invention discloses a double-medium thermochemical energy storage system and method. The double-medium thermochemical energy storage system comprises a first regulating valve, a gas storage tank, a thermochemical reactor, a fan, a steam pocket, a water feeding pump and a circulating water pump, the first regulating valve is communicated with an inlet of the gas storage tank through the fan and the electric heater, an outlet of the gas storage tank is communicated with an inlet of a heat exchange tube in the thermochemical reactor, an outlet of the heat exchange tube in the thermochemical reactor is divided into two paths, one path is communicated with an inlet of the fan, and the other path is communicated with a shell side inlet of the steam pocket; a bottom outlet on the shell side of the steam drum is communicated with an inlet of the circulating water pump after being combined with an outlet of the water feeding pump through a pipeline, an outlet of the circulating water pump is communicated with an inlet of a heat exchange pipe in the thermal chemical reactor, a shell side outlet of the thermal chemical reactor is communicated with the pipe side of the steam drum, and a pipe side inlet of the thermal chemical reactor is communicated with a drainage pipe. According to the system and the method, the heat exchange efficiency of the thermochemical reactor can be improved.

The invention belongs to the field of polycrystalline silicon preparation, and particularly relates to a technology and system for preparing monosilane through fixed bed catalytic cracking of polycrystalline silicon high-boiling residues, the system comprises a feeding unit, a reaction unit and a condensation recovery unit which are connected in sequence, the feeding unit comprises a storage tank, a feeding pump and a preheating mixer which are connected in sequence, and the reaction unit comprises a reaction unit and a condensation recovery unit which are connected in sequence. The preheating mixer is also connected with a hydrogen feeding pipeline, the reaction unit is a fixed bed catalytic reactor filled with a catalyst, and the condensation recovery unit comprises at least one stage of cooler and a recovery tank. By adopting the system, the process disclosed by the invention has the advantages of extremely simple process, high yield, capability of realizing long-term, continuous and stable production, environmental friendliness, easiness in material separation, high conversion rate, good target product selectivity and high trichlorosilane content in a final product.

The invention discloses a coal mill unbalanced data fault diagnosis method based on a Bayesian network, and belongs to the field of generalized zero sample fault diagnosis of a thermal power generation feed pump set. Aiming at the problems of unbalanced fault data distribution, difficult minority class fault diagnosis and poor result interpretability in an industrial scene, sample distribution is collaboratively optimized through SMOTE data enhancement and Dirichlet prior smoothing, a three-layer causal topology network of'fault layer-attribute layer-observation layer 'is constructed, expert knowledge constraint and data-driven learning are combined, and the fault layer-attribute layer-observation layer-based fault diagnosis method is established. High-precision fault classification is realized; a dual-mode diagnosis mechanism is designed, fault node direct inference and attribute node indirect inference are synchronously supported, and explainable physical-level diagnosis guidance is provided while the fault diagnosis accuracy is guaranteed. The method is successfully applied to a coal mill system of a coal-fired unit, and can be expanded to transparent intelligent operation and maintenance of complex industrial equipment.

The invention belongs to the technical field of functional sugar alcohol hydrogenation, and particularly relates to a system and a method for intelligently controlling a reaction kettle in a functional sugar alcohol hydrogenation process. Comprising a temperature sensor TT, a pressure sensor PT, a liquid level sensor LT, a hydrogen concentration sensor TZT and a spectrum sensor, and the sensor networks are arranged on a reaction kettle body, a feeding pipeline, a condenser and a hydrogen recovery device. The device is used for collecting temperature, pressure, liquid level and hydrogen concentration in the reaction kettle and spectral data of an outlet sugar alcohol product in real time. The control execution layer comprises a PLC (Programmable Logic Controller), a dynamic valve controller, temperature control equipment and a stirrer speed regulation module; and the dynamic valve controller is connected to the hydrogen supply pipeline and the feeding pump. The hydrogen flow, the temperature and the stirring speed are adjusted in real time through AI dynamic optimization, the sugar alcohol conversion rate is increased to 5%, and the conversion rate fluctuation range is reduced to + / -0.5%.

The invention belongs to the field of plant extracting solution concentration, and discloses a low-pressure high-power concentration device for a plant extracting solution and a concentration method using the low-pressure high-power concentration device. The device is based on a series reverse osmosis membrane stack and a feeding pump, a fresh water collecting tank, a booster pump, three types of pressure sensors, two types of osmometers, a water inlet pressure control system and a one-way valve are additionally arranged, the three types of pressure sensors are used for detecting the pressure of a feeding header pipe, the pressure of concentrated water and the pressure of a fresh water header pipe respectively, and the two types of osmometers are used for detecting the osmotic pressure of the feeding header pipe and the osmotic pressure of the concentrated water respectively. The water inlet pressure control system adjusts the design pressure of the device and the osmotic pressure of the plant extracting solution by adjusting the frequencies of the booster pump and the feeding pump, so that accurate monitoring of parameters is realized, efficient concentration of the plant extracting solution under low pressure is guaranteed, scaling on the surface of a reverse osmosis membrane is delayed, the service life of a membrane stack is prolonged, and continuous production of membrane concentration and filtration is realized.

The invention belongs to the technical field of thermal power generation control, and particularly discloses an automatic control method for tripping of a high-pressure heater drain pump of a thermal power generating unit, which comprises the following steps: step 1, gradually reducing the coal quantity of the thermal power generating unit according to a preset first rate, and enabling the thermal power generating unit to run in a sliding pressure manner in a steam turbine tracking manner; 2, the real-time coal quantity of the thermal power generating unit is obtained, the total air volume and the primary air pressure are regulated and controlled according to the real-time coal quantity, meanwhile, the locking preset time of boiler core equipment of the thermal power generating unit is regulated and controlled, and the operation number of a coal pulverizing system is regulated and controlled; 3, the feed water flow of a feed pump, the pressure of a condensate pump, main steam parameters of a steam turbine and the final-stage high-pressure heater liquid level are regulated and controlled; and 4, whether the unit load, the feed water flow, the main steam parameters and the final-stage high-pressure heater liquid level meet the control ending conditions or not is judged in real time, and if not, the step 2 to the step 4 are repeated. According to the method, the non-planned shutdown frequency can be remarkably reduced, and the operation reliability and safety of the thermal power generating unit are greatly improved.

The utility model relates to the field of PVC (polyvinyl chloride) reflective film production, in particular to a batching device for ultra-transparent high-elastic PVC reflective film production, which comprises a base and a mixing mechanism, a mixing mechanism used for resin mixing is arranged on the rear side of the top of the base and comprises a motor, a stirring tank and a connecting shaft double propeller, the stirring tank is fixedly connected to the right side of the top of the base, a sealing cover is fixedly connected to the left side of the stirring tank, the motor is fixedly installed in the middle of the left side of the sealing cover, and an output shaft of the motor penetrates through the inner side of the sealing cover and extends into the stirring tank. And output shafts of the motors are fixedly connected with coupled twin propellers. Through cooperation of the mixing mechanism and the batching mechanism, ingredients and raw materials are accurately put into the material storage box and then conveyed to the stirring tank through the material pump; the motor drives the connecting shaft double propellers to rotate and rotate, meanwhile, the heating pipe heats, efficient and uniform mixing of ingredients is achieved, and the problem that mixing is not uniform easily when a single mixing hopper is used for mixing the ingredients is solved.

A desalination system includes a watertight tank built into a barge to house reverse-osmosis tubes and flooded with cooling water or fluid a closed-loop water or a fluid circulation system that circulates water or fluid inside the watertight tank to cool the reverse-osmosis tubes and transfer the heat to a seawater radiator mounted on the exterior of the barge to cool the cooling water or fluid; a reverse-osmosis system consisting of a seawater feed pump sucking in seawater through wedge wire screens attached to an inlet or inlets in the hull of the barge, and pumping that water into a plurality of reverse-osmosis tubes housed within the watertight tank and configured to process the seawater passing through the reverse-osmosis membrane to freshwater water stream and a brine water stream; and a high-density polyethylene (HDPE) pipeline.

The invention discloses a continuous kettle type nitromethane production process, and relates to the technical field of basic chemical raw material synthesis and flow chemical reaction process control, which comprises the following steps: quantitatively and continuously pumping a temperature-regulated sodium nitrite mixed solution into a raw material mixer in a closed-loop automatic control mode through a variable-frequency feeding pump matched with a mass flow meter; synchronously, quantitatively and continuously pumping dimethyl sulfate into the raw material mixer in a closed-loop automatic control manner by matching a feeding pump with a stop valve and a mass flow meter, and uniformly mixing the two raw materials in the raw material mixer according to the stoichiometric molar ratio of the dimethyl sulfate to the sodium nitrite, according to the tandem type segmented design, each reaction kettle can be subjected to customized temperature field control and heat transfer design specially aiming at the special thermodynamic and dynamic requirements of the reaction stage where the reaction kettle is located, the heat transfer efficiency of the whole system is greatly improved, and due to the fact that reaction heat is taken away timely and accurately, the heat transfer efficiency is greatly improved. And a by-product generation path induced by local abnormal high temperature is effectively restrained.

The invention provides a steam turbine generator unit feed pump net positive suction head detection system and method, relates to the technical field of net positive suction detection, and solves the technical problem that net positive suction is difficult to recognize in advance in the prior art. The system specifically comprises a temperature acquisition module used for acquiring the temperature of the deaerator; the judgment and early warning module is used for receiving the flow change rate of the feed pump and triggering alarm when the flow change rate exceeds a flow threshold value; the effective net positive suction head calculation module is used for converting the inlet pressure of the water feeding pump into absolute pressure; temperature correction is conducted on the temperature of the deaerator to obtain the saturation temperature of an inlet of the water feeding pump, the saturation temperature is converted into saturated vapor pressure, and the effective net positive suction head is calculated based on the absolute pressure and the saturated vapor pressure; the necessary net positive suction head obtaining module is used for calling the necessary net positive suction head table and calculating and obtaining the necessary net positive suction head; and the net positive suction head calculation module is used for receiving the effective net positive suction head and the necessary net positive suction head and calculating the net positive suction head. The device is used for detecting the net positive suction head.

The invention relates to a device and method for controlling a lubricating oil interruption test of an aero-engine, and the device comprises a valve assembly which is communicated with an oil supply pump of the aero-engine to be tested; and a controller electrically coupled to the valve assembly, the controller for: causing the valve assembly to supply gas to the oil feed pump to initiate a grease interrupt test; when the lubricating oil interruption duration is close to the lubricating oil interruption duration set value, the valve assembly supplies gas to the oil supply pump and compensates the oil supply pump with lubricating oil at the same time; and when the lubricating oil interruption duration reaches the lubricating oil interruption duration set value, the valve assembly supplies the lubricating oil and stops supplying the gas.

The invention belongs to the technical field of heat pump rectification, and particularly relates to a double-effect heat pump rectification system which comprises a first-effect rectification tower feeding pump connected with a preheater, the preheater is connected with a first-effect rectification tower, the first-effect rectification tower is connected with a gas-liquid separator through a screw compressor, and the gas-liquid separator is connected with a tail gas condenser through a second-effect falling film reboiler. The second-effect falling film reboiler is connected with a first-effect reflux discharge pump through a first-effect reflux tank, and the first-effect reflux discharge pump is connected with the preheater; the first-effect rectifying tower is respectively connected with a first-effect falling film reboiler and a first-effect falling film circulating pump; the first-effect rectifying tower is connected with a second-effect rectifying tower through a first-effect tower kettle discharging pump; the first-effect falling film reboiler is connected with a second-effect reflux discharge pump through a second-effect reflux tank; the second-effect falling film reboiler is connected with a second-effect falling film circulating pump and a second-effect rectifying tower, the second-effect falling film reboiler is connected with a second-effect rectifying tower kettle discharging pump through the second-effect rectifying tower, and the second-effect rectifying tower is connected with the first-effect falling film reboiler. According to the invention, double-effect rectification and heat pump rectification are successfully combined, and the cost is low.

The invention discloses an agricultural spraying device for agricultural planting, and relates to the technical field of agricultural planting, the agricultural spraying device comprises a bottom plate and further comprises a mixing box arranged above the bottom plate, the top of the mixing box is fixedly connected with a transmission box, a transmission assembly is arranged in the transmission box, a stirring assembly is arranged in the mixing box, and a batching assembly is arranged on one side of the mixing box; the bottom of the mixing box is fixedly connected with a feeding pump, the discharging end of the feeding pump is fixedly connected with a mounting pipe, the bottom of the mounting pipe is fixedly connected with a guide box, one side of the mounting pipe is fixedly connected with a detection cylinder, a pressure detection assembly is arranged on one side of the detection cylinder, and an alarm assembly is arranged on the bottom plate on one side of the pressure detection assembly. A lifting spraying pipe is arranged on one side of the discharging end of the material guiding box, lifting adjusting assemblies are arranged on the two sides of the lifting spraying pipe, a swing spraying assembly is arranged above the lifting spraying pipe, a telescopic pipe is fixedly connected between the lifting spraying pipe and the material guiding box, and the device is wider in spraying range, more flexible to use and higher in safety.

The utility model relates to an ammonium phosphate evaporation and concentration system and belongs to the field of chemical engineering. The system comprises a concentrated ammonium phosphate pump, a concentrated ammonium phosphate storage tank, an I-effect evaporation chamber, an I-effect heater, an I-effect circulating pump, an I-effect charging pump, an II-effect evaporation chamber, an II-effect heater, an II-effect circulating pump, an II-effect charging pump, an III-effect evaporation chamber, an III-effect heater and an III-effect circulating pump. By adopting the system and the method, low-pressure saturated live steam is utilized to indirectly heat dilute ammonium phosphate to generate secondary steam and tertiary steam to continuously heat the dilute ammonium phosphate to produce concentrated ammonium phosphate. Compared with a two-effect evaporation concentration process flow which is widely used at present, the three-effect countercurrent evaporation concentration process flow saves energy by 47%. The utility model aims at saving energy, reducing consumption, reducing carbon emission of a production device and protecting the environment.

The invention discloses a vertical sand mill which comprises a rotary power mechanism, a feeding pump, a stirring device and a sand milling cylinder, and the stirring device comprises a hollow main shaft, a disperser and a separator. The disperser comprises a plurality of rotors and a plurality of rod nails, the rod nails are fixed between the upper rotor and the lower rotor through bolts, and the outer side ends of the rod nails protrude out of the outer peripheries of the rotors. By means of the design, when the rotary power mechanism works, the separator can generate centrifugal force, under the action of the centrifugal force, grinding media are accumulated on the outer periphery of the separator, materials are accumulated in the center area of the separator and then discharged outwards, a screen is not needed, and the problem that the screen is blocked does not exist. Meanwhile, the rotor and the rod nails are fastened on the periphery of the main shaft through the bolts in a sleeved mode, the mode that the blades are welded to the main shaft is not adopted, in the rotating process of the rotor and the rod nails, the problem that the rotor and the rod nails are fractured with the main shaft is solved, the service life of the machine is long, the maintenance cost is low, and in the production process, the stability and the safety are good.

The invention relates to a modular methanol reforming hydrogen production system, and belongs to the technical field of new energy of methanol reforming hydrogen production. The hydrogen production system comprises a control system, an air inlet module, a methanol supply module, a plurality of methanol reforming hydrogen production modules, a reformed gas main pipeline and a tail gas main pipeline, wherein the methanol reforming hydrogen production module comprises a methanol reformer, a tail gas heat exchanger, a methanol evaporator, a methanol aqueous solution sub-feeding pump, a methanol aqueous solution sub-pipeline, a reformed gas sub-pipeline and a tail gas sub-pipeline; the methanol reformer comprises a vaporizing chamber, an oxidizing chamber and a reforming chamber; an outlet of high-temperature tail gas generated by the oxidizing chamber is connected with the tail gas heat exchanger and the methanol evaporator; and the methanol aqueous solution main storage tank is sequentially connected with the methanol evaporator, the tail gas heat exchanger and the reforming chamber through a methanol aqueous solution feeding pump. The methanol reforming hydrogen production system adopts a modular design, is simple in equipment, high in expansibility, quick to start and adjustable in hydrogen production amount, and realizes instant production and instant use of hydrogen energy and hydrogen.

The present invention discloses a coal tar suspension bed coupled with a fixed bed hydrocracking process and device, which includes a catalyst storage tank connected to a catalyst mixing tank, and the catalyst mixing tank is connected to a catalyst feed pump; it also includes a coal tar buffer tank, the coal tar buffer tank is connected to a slurry feed pump, the slurry feed pump is connected to a first heating furnace, the first heating furnace is connected to a hydrogen heating furnace, and the hydrogen heating furnace is connected to a first suspension bed reactor; the coal tar buffer tank is also connected to a first vacuum tower, the first vacuum tower is connected to a second heating furnace, the second heating furnace is connected to a hot low-pressure separator, the first suspension bed reactor is connected to a second suspension bed reactor, the outlet of the second suspension bed reactor is connected to a hot high-pressure separator, the hot high-pressure separator is connected to a cyclone separator and a hot medium-pressure separator, and the cyclone separator is connected to a fixed bed reactor. The process flow of the present invention is short, with high conversion rate and light oil yield, low energy consumption, and the reactor and the feed mixing system are not easily blocked, and the vacuum system is not easily worn.

The utility model belongs to the field of chemical raw material recovery, and discloses a system for recovering sodium bicarbonate from purified terephthalic acid membrane concentrated water. The system comprises an acidification subsystem, a low-temperature evaporative crystallization subsystem and a salt leaching subsystem, the acidification subsystem comprises a concentrated water feeding pump and an acid feeding pump; the acidification tower comprises a tower body and a tower kettle which are connected up and down; an acid feeding hole is formed in the middle lower part of the tower body, and a concentrated water feeding hole is formed in the middle upper part of the tower body; the concentrated water feeding pump is connected with the concentrated water feeding hole; the acid feeding pump is connected with the acid feeding hole; the salt leaching subsystem comprises a salt leaching kettle; the salt leaching kettle is provided with a middle salt feeding hole, a middle solution feeding hole and a bottom material outlet; and a fresh saturated sodium bicarbonate solution feeding pipeline is connected with a middle solution feeding hole of the salt leaching kettle through a solution feeding pump. The utility model solves the technical problems of high energy consumption, low product purity and greenhouse effect during purified terephthalic acid membrane concentrated water treatment. And high-purity sodium bicarbonate is recovered from the purified terephthalic acid membrane concentrated water under low energy consumption.

The invention discloses an integrated hydraulic turbine furnace water circulating pump and a starting and stopping method. The furnace water circulating pump is sequentially divided into a hydraulic turbine unit, a first water chamber unit, a furnace water pump unit, a second water chamber unit and an axial force balancing unit according to functions. By designing a unique main and auxiliary channel water inlet structure, the problem of water sealing of a high-temperature and high-pressure furnace in a conventional shaft seal pump is solved, the working environment of each sealing element is greatly improved, the service life is prolonged, and meanwhile, the inner core can be integrally pulled out for replacement and is convenient to overhaul. On the basis, a step-by-step pre-heating and rapid shutdown method is further designed, the reliability under frequent start and shutdown is improved, the service life is prolonged, the start and shutdown process is further deeply fused into the deep peak regulation process of the supercritical boiler, the feed water flow of the supercritical boiler can be rapidly recovered after a hydraulic turbine boiler water circulating pump exits due to an accident, and the service life of the supercritical boiler is prolonged. And the fault of water cut-off and shutdown is avoided. Meanwhile, the recycling function of a steam feed pump set can be replaced, and the reliability of a water supply system is improved.

The utility model discloses a device for continuously producing polyether. The device comprises a mixing kettle, a mixing kettle discharging pump, a receiving tank A, a receiving tank discharging pump A, a PO feeding pump, a static mixer, a pipeline reactor, a reactor discharging pump, an adsorption tower, an adsorption tower discharging pump, a receiving tank B, a receiving tank discharging pump B and a distillation tower, the method comprises the following steps: mixing an alcohol raw material and a catalyst in a mixing kettle, pumping into a receiving tank A for temporary storage, pumping the mixed material in the receiving tank A into a static mixer, mixing with epoxypropane, feeding into a pipeline reactor for reaction, pumping the reaction product in the pipeline reactor into an adsorption tower to remove metal elements introduced by the catalyst, a reaction product in the adsorption tower is pumped into a receiving tank B for temporary storage through an adsorption tower discharging pump, a reaction product in the receiving tank B is pumped into a distillation tower for distillation and purification, and purified polyether is obtained. By adopting the continuous production device, the energy consumption can be reduced, the generation of waste gas, waste residues and waste water is reduced, and the production cost is further reduced.

The invention relates to the technical field of gas-liquid separation and purification, in particular to an energy-saving type self-gravity condensation reflux efficient rectification system and a control method. Comprising a buffer tank, a feeding pump, a feeding and discharging thermal coupling heat exchanger, an efficient rectifying tower, a self-gravity reflux condenser, a tower bottom reboiler and a tower bottom extraction pump, the self-gravity reflux condenser is arranged at the top of the high-efficiency rectifying tower, the feeding and discharging thermal coupling heat exchanger is connected between the buffer tank and a feeding hole of the high-efficiency rectifying tower, a tower bottom outlet of the high-efficiency rectifying tower is connected with the tower bottom reboiler and an inlet of the tower bottom extraction pump, and an outlet of the tower bottom reboiler is connected with a circulating feeding hole of the high-efficiency rectifying tower; the self-gravity reflux condenser is used for condensing the tower top gas phase part into liquid, and the liquid flows back to the efficient rectifying tower through gravity; the feeding and discharging thermal coupling heat exchanger is used for exchanging heat between the raw material output by the buffer tank and a tower bottom product of the efficient rectifying tower; and the tower bottom extraction pump is used for outputting tower bottom products. Resource waste is avoided, and equipment investment and occupied area are reduced.

The present invention discloses a large-scale seed cultivation device, which relates to the technical field of seed cultivation, and includes a configuration device and a cultivation device. A control valve is provided at the bottom of one end of the feed pipe away from the feed pump, and a discharge end is provided at one end of the feed pipe away from the feed pump. The cultivation device is arranged on one side of the mobile water tank. In this large-scale seed cultivation device, after each injection of nutrient solution, the feed pump pumps clean water to the side of the rotating baffle and the hollow plate to wash the inside of the feed pipe. Due to the push of the clean water, the rotating baffle and the hollow plate gather and move the residual nutrient solution on the other side and discharge it into the nutrient solution temporary storage tank. After washing, dry air is injected into the feed pipe through the dry air pipe for air drying, thereby ensuring that the subsequent nutrient solutions of different concentrations are not affected by the concentration of the previous residual nutrient solution during transportation and causing dilution, so as to ensure that the nutrient solution concentration received by the seeds in each cultivation tank meets the preset value.

The embodiment of the invention discloses a feeding system and method for a wet oxidation treatment process, and the system comprises a material feeding tank, a normal-pressure feeding pump set which is used for pumping a to-be-treated material into the material feeding tank, a pressurization system which is used for filling the material feeding tank with gas, and a feeding pump set which is used for pumping the to-be-treated material into the material feeding tank, and the pressure relief system is used for discharging redundant gas in the material feeding tank. The process is simple, the material feeding tank with the normal pressure and high pressure seamless switching function is ingeniously integrated at the front end of the wet catalytic oxidation treatment process, it is ensured that raw materials are stably and efficiently supplied to the pressurized reactor / kettle, the safety and flexibility of the whole treatment process are improved, and the production cost is reduced. In the feeding link, the dependence of a traditional process on a high-pressure pump is thoroughly eliminated, the initial equipment investment cost is greatly reduced, the problem that the feeding pump is frequently overhauled due to abrasion is effectively relieved by reducing direct pumping of materials in a high-pressure environment, and the maintenance frequency and the maintenance cost are greatly reduced.

The invention relates to a continuous preparation method of a supported catalyst and application of the supported catalyst in catalysis of furfural hydrocracking. The method comprises the following steps: adding Cu (NO3) 2.3 H2O, Ce (NO3) 3.6 H2O, Mg (NO3) 2.6 H2O and Al (NO3) 3.9 H2O into deionized water to form a solution A; naOH and Na2CO3 are taken and dissolved in deionized water, and a solution B is formed; then respectively introducing the solution A and the solution B into a feeding pump, then introducing into a membrane dispersion microreactor, and mixing to form a precipitate; and washing, drying, calcining and reducing to obtain the catalyst Cu-Ce / MgO-Al2O3. The catalyst prepared by the invention is used in a reaction for catalyzing furfural hydrocracking to prepare 1, 2-pentanediol, and shows excellent catalytic activity and stability, the conversion rate of furfural is as high as 99%, and the yield of 1, 2-pentanediol reaches 44%.

The invention provides a 1000MW supercritical generator set feed water flow fluctuation treatment method which comprises the following steps: optimizing hydraulic characteristics of a feed pump core bag by adopting a method of replacing a first-stage impeller, an impeller, a guide vane, a balancing drum and matched components in the feed pump core bag so as to increase the gradient of a feed pump performance curve; a safety valve is additionally arranged on an outlet pipeline of the feed pump; the actual working pressure of an outlet pipeline of the water feeding pump is obtained; the actual working pressure in the outlet pipeline of the water feeding pump is compared with the designed action pressure when the safety valve is installed, and when the actual working pressure in the outlet pipeline of the water feeding pump exceeds the designed action pressure when the safety valve is installed, the safety valve is installed; and the safety valve is automatically opened to release excessive pressure in the outlet pipeline of the water feeding pump, so that abnormal overpressure of the outlet pipeline of the water feeding pump is avoided. And the lift of a closing point is improved, and the gradient of a performance curve of the feed pump is increased, so that the low-load feed water flow fluctuation is improved.

The utility model discloses NMP (N-Methyl Pyrrolidone) recovery equipment which comprises a preheater, a condensate water heater, a scraper falling film evaporator, a tower top full cooler, a tower top vacuum trap, a product cooler, a raw material deaerator, a tower bottom heat pump, an evaporator feeding pump, a light component discharging pump, a dividing wall rectifying tower and a light component temporary storage tank, the dividing wall rectifying tower comprises a tower body, the bottom in the tower body is provided with a first space and a second space which are separated by a partition plate, a first packing layer is arranged above the first space, a second packing layer is arranged above the second space, a discharging cavity is formed in the middle area of the second packing layer, and a third packing layer is arranged on the upper portion in the tower body. A built-in condensation reflux device is arranged above the third filler layer; an outlet of a heating channel of the preheater is connected with an inlet of the raw material deaerator; the condensate water heater is connected with the outlet of the raw material deaerator and the lower part of the first space of the dividing wall rectifying tower. The NMP recovery equipment is low in investment cost, low in process energy consumption and capable of stably running for a long time.

The utility model belongs to the technical field of feed pump devices, and particularly relates to a novel steam feed pump device which comprises a base, a motor and a pump body, an output shaft of the motor is connected with a flange and is connected with an impeller of the pump body, the top end of the base is vertically connected with a screw, and a protective cover is arranged at the top end of the flange. The protective cover is used for effectively shielding the flange, it is ensured that the flange and a connecting bolt of the flange are not invaded by dust, due to the design, the convenience of dismounting and mounting the flange is remarkably improved during maintenance, the maintenance time is effectively shortened, and then the overall maintenance efficiency of the water feeding pump is improved. In addition, by arranging the cooling fan, the motor and the pump body can be effectively cooled, temperature rise caused by long-time work of the motor and the pump body is prevented, and therefore the service life of the motor and the service life of the pump body are effectively prolonged.

The invention discloses a mechanical sealing device of a boiler feed pump, and aims to solve the problem of performance change caused by long-term high-temperature environment of a mechanical sealing spring in the prior art. The device comprises a ring seal set arranged in a gap between a feed pump end shell and a shaft body, a spring set is arranged on the side edge of the ring seal set, and the end, away from the ring seal set, of the spring set protrudes out of the end shell and makes contact with an end plate arranged on the shaft body in a sleeving mode. The key point is that an air bin is arranged at a gap formed by the spring group and the shaft body, and the air bin is communicated with the outside through a ventilation pipe; and the side edge of the end plate is sleeved with an exhaust fan synchronously rotating with the shaft body. When the water feeding pump works, the exhaust fan rotates, hot air in the space where the spring set is located is pumped out, and meanwhile the air bin sucks cold air from the outside to form continuous airflow circulation, so that the spring set is effectively cooled, the risk that the performance of the spring is reduced due to high temperature is reduced, and the stability and the service life of the mechanical seal are guaranteed.

A feed valve, a tail gas outlet valve and a filter circulating valve are arranged at the top of a stirring tank, the upper side surface of the stirring tank is connected with the upper part of a filter through a filter overflow valve pipeline, and a bottom outlet of the stirring tank is connected with the bottom of the filter after being connected with a feed pump; a filter discharge pipe is divided into two paths, one path is connected with the receiving tank through a discharge valve, and the other path is connected with a filter circulating valve; a discharge pipe of the receiving tank is connected with a finished product storage tank after being connected with a discharge pump; a tail gas pipeline with a tail gas outlet valve at the upper part of the receiving tank is connected with a gas inlet of a spiral plate heat exchanger after being converged with a tail gas pipeline with a stirring tank tail gas outlet valve; the upper gas outlet of the heat exchanger is connected with a gas buffer tank after being connected with an induced draft fan, a cooling water outlet valve is arranged on the upper side, and a cooling water inlet valve is arranged on the lower side; a lower outlet pipeline is connected with a buffer tank bottom valve, then is converged with a discharge pipeline of the heat exchanger and then is connected with a solvent recovery tank, and a discharge valve is arranged at the bottom of the gas buffer tank. The device is pollution-free in production, energy-saving and consumption-reducing.